engine



2 Sheets-Sheet 1.

(No Model.)

W. P. DAKE.

ENGINE.

No. 395,039; Patented me: 25, 1888 EH a INVENTOR wvf BY M' WITNESSES:

ATTORNEYS.

N, PETERS. Phmouthugnphcr. Wuhingmn, n. c

(No Model.) 2 Sheets- Sheet 2.

W. F. DAKE. Y

. ENGINE. No. 395,039. Patented Dec. 25, 1888.

D I 4: g A WITNESSES:' c 7 INVENTOR;

S BY 2 Q a Q HATTORNEYS.

N. FEYERS. Phomumo n hur. Washington. D. c.

UNITED STATES PATENT OEETcE.

IVILLIAM F. DAKE, OF GRAND HAVEN, MICHIGAN, ASSIGNOR TO THE DAKE ENGINE MANUFACTURING COMPANY, .OF SAME PLACE.

ENGINE.

SPECIFICATION forming part of Letters Patent No. 395,039, dated December 25, 1888. Application filed July 3, 1888 erial No. 278,939. (No model.)

To all whom it may concern.-

Be it known that I, TILLIAM F. DARE, of Grand Haven, in the county of Ottawa and State of Michigan, have invented a new and Improved Engine, of which the following is a full, clear and exact description.

The invention relates to the class of double reciprocating square piston-engines such as shown and described in Letters Patent No.

363,368, granted to me May 24, 1887.

The object of the present invention is to provide a new and improved engine which is simple and durable in construction and very effective in operation.

The invention consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a front view of the improvement with the cover removed and the steam-chest in section. l ig. is asectional view of the same on the line 0;:1; of Fig. 1; Fig. 3 is an inner lace view of part of the cover. Fig. a

face view of the piston with the cover re- -moved and parts in section. Fig. 5 is a face go-view of the improvement with parts broken out. same on the line y y of Fig. 5. .plan view of the casing, the steam-chest being removed; and Fig. 8 is a sectional plan view of the steanrchest on the line .2 z of Fig. 5.

The improved engine is provided with a casing, A, of suitable shape and material and having a chamber, A, in which is held to move backward and forward horizontally a rectangular piston, B, having a chamber, B,

in which is mounted lo slide vertically the inner piston, (f, mounted in its middle on a l g of the casing A by live steam entering between the said plates K and K and the piswrist-pin, I), i rojecting through a slot in the back plate of the piston B and secured to a crank-dish, E, fastened on the inner end oi the main driving-shaft F. On top of the casing A is secured the steam-chest G, provided with a four-way valve, 11, having a handle, H, on its inner end for turning said valve H in any desired position. Other suitable means i may be employed for turning the \IlX'G, if del l l Fig. 0 is a sectional plan view of the 1 Fig. 7 is a sired.

Into the valve H leads the steam-inlet pipe I, and the said valve also connects with the exhaust-pipe 1', leading from the valve-chest G. The valve H is adapted to connect the steam-inlet pipe I either with the port a or the port I), and also to connect the exhaustpipe I with the said port a orb. The ports a and b are formed in the steam-chest G and lead to the ports 0 and cl, formed in the casing A, and the ports a and cl connect with the channels 0 and f, respectively, formed in the outside of the cover J of the casing A. The channel 6 leads to a central aperture, g, formed in the middle of the cover J and opening at the inside against the face of the inner piston, C. The channel f leads to an annular opening, h, also formed on the inside of the cover .I and opening on the face of the inner 7o piston, C.

The central opening, g, and the annular opening 71 are adapted to connect alternately with the ports 1', 2', 2' and 2' formed in a circle in the inner piston, C, and of which the 75 port "2' leads through a channel, '2 to an opening It", formed in the left side of the said piston B and leading to thechamber A of the casing A. The port 2" leads to the channel 1"", opening into the chamber B of the piston B at the top of the inner piston, C. The port 2' is similar to the port i and leads to a channel, i which connects with an opening, lo, formed in the right end of the piston B and leading to the chamber A of the casing at the right of the piston B. The port 2' similar to the port i and leads to the channel opening into the chamber B of the piston. i l at the bottom of the inner piston, C.

In the back of the piston B are formed vertical recesses, into which lit the packingplates K and K, pressed against the rear wall ton I through openings I. and L, connected 5 with each other by a groove, L in the top of the casing A, as is plainly shown in Fig. 7.

' The groove L connects with the openings L and L formed in the steam-chest G and leading into the ports a and b, so as to admit IOO live steam into the groove L from which the live steam passes through the openings L and and L between the packing-plates K and K. and the piston ll, so as to form a steam-tight packing.

The inner piston, C, is provided at its ends with the packing-plates N and N, of any approved construction and pressed against the end walls of the piston l) by any suitable means, so as to form a steam-tight packing between the said inner piston, and the piston B.

The wear of the latter is taken up by a plate, 0, supporting the bottom of the said piston B and resting against the plate P, held to slide longitudinally by screws 1 in the casing A bearing against the ends of the said plate P. 'On the under side of the latter are formed the inclines P sliding on corresponding inclines, A formed in the bottom of the casing A. Thus, when the screws P are adjusted the plate I presses this plate upward in firm contact with the bottom of the piston B.

The operation is as follows: 'hen the engine in the position shown in Fig. 1, steam passes from the inlet-pipe I through the valve ll into the port a, and from the latter the steam passes through the port 0 into the channel 6 and into the central opening, g, formed in the cover J. The steam now passes from the central opening, g, into the port L'- of the inner piston, and through the channel 1" and the opening it into the left end of the chamber (1, thus acting against the piston B from the left to the right, so that the said piston B is-caused to slide from the left to the right. Rotary mo tion is thus imparted to the main shaft F by the inner piston, the crank-pin D, and the crank-disk E, secured to the said main shaft i The inner piston, (1, in moving causes the port i to register with the central opening, g, so that live steam now passes into the port 1" from the latter through the channel if into the chamber ii of the piston 1- on top of the piston C. The latter is thus pressed downward by the steam, whereby a new impulse is given to the main driving-shaft F by the action of the crank-pin D and the crank-disk E. ()n the further movement of the pistons l5 and C, as above described, the central opening, g, registers with the port so that the live steam passes through the channel 1" and the opening k into the chamber A at the right end of the piston I so that the latteris now forced to its return-strokethat is, to the left of the casin g A. The further movement of the pistons B and C now brings the central opening, g, to register with the port 1' so that the live steam passes through the channel 2' into the chamber B at the bottom of inner piston, The live steam thus presses the inner piston, upward, at the same time assisting the piston 1-3 in its movement to the left. The exhaust-steam from the left of the chamber A passes through the opening 7r, the channel II, and the port i into the annular opening It, formed in the cover J and leading to the channel f, connected by the port (1 with the port I) in the steanrchest G. Steam then passes from the port (Z through the valve ll into the exhaustpipe I and to the outside. The exhaust at the upper end of the chamber l passes through the channel i into the port 1", and from the latter to the annular opening 11, through which it passes to the exhaust-pipe I, as above described in reference to the port '1'. The exhaust in the right of the compartment A takes place through the opening 71:, the channel 1", and the port 6 into the annularopening 71, and the exhaust in the bottom of the chamber. 5 takes place through the channel i and the port i into the annula r opening 71, from which the steam passes to the exhaust-pipe I, above described.

It is understood that the mox'ement of the inner piston, brings the ports 1', 2 ,11 and 1" alternately to register with the central opening, g, and at the same time the exhaustports exhaust through the annular opening [1.

'hen the valve 1-! is turned, the live steam passes from the inlet-pipe I to the port I), and the port a is then connected with the exhaustpipe 1?. The above-described operation is re peated, except that it is in the reverse direction.

It will be observed that by the construction of this engine there are no valves whatever except on the face of the inner piston, (.3, against: the cover-plate J, and no eccentric or other devices are needed to operate the valve, the action being directly upon the piston G and cover J to cut off and let in steam at the proper time to give continuous motion to the engine.

Having thus fully described my invention, 1 claim as new and desire to secure by Letters l.atent- 1. In an engine, the combination, with a casing and a piston reci nocating therein, of a second piston arranged within and liaving a reciprocating motion at right angles to the line of movement of the first-named piston,

the outer face of the said second valve form-\mm ing a valve for operating both pistons, substantially as described.

2. In an engine, the combination of a casing having a central opening in the inner surface of its front plate, a piston reciprocating therein, a second valve arranged within and having a reciprocatingmotion at right angles to line of movement of the first-named piston and provided with ports 011 its outer face, said port-s being arranged in a circle and operating over the said central opening of the casing, substantially as herein shown and described.

3. In a steanrengine of the class (lOSOlllJGtl, the combination, with an inner piston having steam-port's arranged in a circle, of a cover having a central opening and an annular opening adapted to register with the said ports, substantially as shown and described.

4. In a steam-engine oi the class described, the combination, with an inner piston provided with the ports 1,6, 43 and d of an outer piston having the openings k and it, connecting with the said ports 1' and 1' and a casing surrounding the said outer piston, substantially as shown and described.

5 In an engine of the class described, the

' combination, with a casing and a steam-chest held on the said casing, of a piston mounted to slide horizontally in the said casing, and packing-plates held at the'back of the said piston and pressed against the back of the said cas- WILLIAM F. DAKE.

Witnesses:

OHAs. T. PAoELsoN, J. P. ARMSTEAD.

21 Letters Patent No, scenes crreciions It is hereby Certified that in Letters Patent No. 395,039, granted December 25, 1888, upon the application of William Dake, of Grand Haven, Michigan, for an improvement in Engines, errors appear in the printed specification requiring correction as fellows: In lines 116 and 122 page 2, the ivord valve should read piston and in line 124 same page the word the should be inserted before the Word line; and that the said Letters Patent should be read with these corrections therein to conform to the papers pertaining to the case in the Patent Office.

Signed, countersigned, and sealed this 1st day of January, A. D. 1889.

[SEAL] D. L. HAWKINS,

Assistant Secretary of the Interior. Gountersigned BENTON J. HALL Oomnm'sst'oner of Patents. 

